:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #16181d;
  --quiet: #5b616e;
  --rule: #e2e4e9;
  --accent: #1f5fbf;
  --warn-bg: #fff6e5;
  --warn-ink: #7a4b00;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --card: #1b1e24;
    --ink: #eceef2;
    --quiet: #a3a9b5;
    --rule: #2c3038;
    --accent: #7fb0ff;
    --warn-bg: #2e2412;
    --warn-ink: #f3c879;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", sans-serif;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 420px;
  margin: 0 auto;
  padding: max(20px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom));
}

.head { margin-bottom: 16px; }
.org {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
}
h1 { margin: 2px 0 0; font-size: 22px; line-height: 1.3; }
h2 { margin: 0 0 8px; font-size: 18px; }
.en { display: block; font-size: 0.85em; font-weight: 400; color: var(--quiet); }
h1 .en, h2 .en { display: inline; margin-left: 4px; }

.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 16px;
  padding: 20px;
}

/* The QR always sits on white with its quiet zone, in light and dark mode. */
.qr {
  background: #ffffff;
  border-radius: 12px;
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
}
.qr svg { display: block; width: 100%; height: 100%; }

.ref { text-align: center; margin: 16px 0 4px; }
.ref-label { margin: 0; font-size: 13px; color: var(--quiet); }
.ref-label .en { display: inline; }
.ref-no {
  margin: 2px 0 0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.steps {
  margin: 16px 0 0;
  padding: 16px 0 0 20px;
  border-top: 1px solid var(--rule);
  font-size: 15px;
}
.steps li + li { margin-top: 10px; }

.error { background: var(--warn-bg); border-color: transparent; color: var(--warn-ink); }
.error p { margin: 0 0 8px; }
.error .en { color: inherit; opacity: 0.85; }

.foot { margin-top: 20px; font-size: 12px; color: var(--quiet); text-align: center; }
.foot p { margin: 0 0 4px; }
.foot .en { font-size: 1em; }

[hidden] { display: none !important; }